不错，很适合课堂小练笔。

谢谢楼主分享~~~~

Thank you very much

难点难教啊，学生学的累教得也累，谢谢啦

谢谢你的劳动成果。支持下

谢谢楼主无私的奉献，向你学习，向你致敬。

thank you very much

Thank you very much

thanks a lot!!!!!!!!!!!!!!!

归纳的很好
继续努力